Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Nano-optics of metallic and semiconducting nanostructures (time resolved)
O 20.6: Vortrag
Dienstag, 24. März 2009, 11:45–12:00, SCH A216
Subwavelength spatio-temporal control of the local excitation of metal nanostructures — Martin Aeschlimann1, Michael Bauer5, •Daniela Bayer1, Tobias Brixner3, Stefan Cunovic2, Frank Dimler3, Alexander Fischer1, Javier García de Abajo4, Viktor Myroshnychenko4, Walter Pfeiffer2, Martin Rohmer1, Christian Schneider1, Felix Steeb1, Christian Strüber2, and Dmitri V. Voronine3 — 1University of Kaiserslautern, Germany — 2University of Bielefeld, Germany — 3Ludwigs-Maximilian-Universität, Würzburg, Germany — 4CSIC, Madrid, Spain — 5University of Kiel, Germany
Using time-resolved two-photon photoemission electron microscopy we demonstrate simultaneous spatial and temporal control of nanooptical fields. Based on the recent demonstration of ultrafast adaptive near field optics, we now investigate directly the temporal evolution of the local excitation by spatially resolved cross correlation measurements. Planar silver nanostructures manufactured by e-beam lithography are excited by polarization shaped pump pulses and the corresponding local excitation is probed by a time-correlated probe excitation using circularly polarized laser pulses. The time-resolved cross correlation traces for different regions of the nanostructure show a clear variation of their relative intensities. This confirms that the polarization-shaped incident laser pulse does indeed switch between two different excitation patterns within a time scale that can be controlled almost freely and is limited only by the spectral bandwidth of the used coherent light source. First spatio-temporal control experiments will be shown.